Santa Clara Basin Stormwater Resource Plan

Transcription

1 Santa Clara Basin Stormwater Resource Plan November 29, 2018 Vishakha Atre SCVURPPP

2 Presentation Overview Stormwater Resource Plan (SWRP) Description and Purpose Methodology for Identifying and Prioritizing Potential Project Opportunities SWRP Implementation / Next Steps

3 What is a Stormwater Resource Plan? A planning document that: describes the local watershed identifies water quality issues identifies public lands (i.e., streets, parks, and municipal properties) that offer opportunities to locate stormwater capture projects evaluates and prioritizes potential project opportunities that provide multiple benefits SB985 (2014) requires a SWRP as a condition of receiving funds for runoff capture projects from any bond approved by voters after January 2014

4 Santa Clara Basin SWRP Proposition 1 Stormwater Planning Grant Awarded to the Santa Clara Valley Water District and SCVURPPP to prepare a SWRP for the Santa Clara Basin in Santa Clara County Total Project Budget: $940,000 Grant amount: ~$470,000 50% match (~$470,000 in-kind + SCVURPPP tasks) Start Date: February 2017 Completion Date: December 2018

5 SWRP Purpose Identify potential GSI opportunities throughout the Santa Clara Basin Produce list of prioritized multi-benefit project opportunities eligible for future State grant funds - Water quality improvement - Water supply (including stormwater capture & use) - Flood management - Environmental - Community Support development and implementation of municipal GSI Plans within the Basin

6 SWRP Partners and Roles State Water Resources Control Board SCVURPPP Management Committee Project Team: Santa Clara Valley Water District SCVURPPP Consultant Team: Paradigm Environmental Lotus Water SFEI TAC Stakeholder Group SWRP Analyses/Development Conceptual Designs

7 SWRP Area Planning area for the SWRP is the Santa Clara Basin Watershed This is the portion of Santa Clara County that drains to San Francisco Bay

8 Identification/Prioritization of Project Opportunities Developed criteria for evaluating project opportunities Used GIS tools and datasets to identify public parcels and streets Screened parcels and streets to identify those suitable for locating GSI features.

9 Parcel Screening Screening Factor Ownership Parcel Size Criteria Public Parcels > 0.25 acres = Regional/LID < 0.25 acres = LID only Site Slope < 10 %

10 Street Screening Screening Factor Ownership Surface Criteria Public Paved Slope < 5% Speed 45mph

11 Identification/Prioritization of Project Opportunities Classified opportunities by project scale/type Conducted a metrics-based analysis to evaluate the potential benefit of every screened project opportunity Developed list of prioritized (scored/ranked) project opportunities Used hydrologic models to quantify water quality benefits for 21 high priority potential projects Prepared conceptual designs for 11 opportunities

12 Identification/Prioritization of Opportunities LID Projects on Individual Parcels (treat only on-site runoff) Regional Projects (treat on-site and off-site runoff) Green Streets (treat runoff from street and adjacent areas)

13 Prioritization Metrics for LID Projects Metric Parcel Land Use Points Schools/Golf Courses Weight Factor Park / Open Space Public Buildings Parking Lots -- Impervious Area (%) X < X < X < X < X < X < Hydrologic Soil Group C/D B A -- Slope (%) 10 > X > 5 5 X > 3 3 X > 2 2 X > 1 1 X -- Within flood-prone storm drain catchments Contains PCB Interest Areas None Moderate High 2 Within Priority Development Area Co-located with another agency project Augments water supply No Opportunity for capture and reuse Above groundwater recharge area and not above groundwater contamination area Water quality source control 2 Reestablishes natural hydrology Creates or enhances habitat Community enhancement No Opportunities for other enhancements Within DAC or MTC Community of Concern --

14 Metric Parcel Land Use Prioritization Metrics for Regional Projects Points Weight Factor Schools/Golf Courses Public Buildings Parking Lot Park / Open Space -- Impervious Area (%) X < X < X < X < X < X < Parcel Size (acres) 0.25 X < X < 1 1 X < 2 2 X < 3 3 X < 4 4 X -- Hydrologic Soil Group C/D B A -- Slope (%) 10 > X > 5 5 X > 3 3 X > 2 2 X > 1 1 X -- Proximity to Storm Drain (feet) Within flood-prone storm drain catchments Contains PCB Interest Areas Within Priority Development Area Co-located with another agency project Augments water supply Water quality source control Reestablishes natural hydrology Creates or enhances habitat Community enhancement X > 1,000 1,000 X > X > X -- None Moderate High 2 No Opportunity for capture and reuse Above groundwater recharge area and not above groundwater contamination area No Opportunities for other enhancements Within DAC or MTC Community of Concern 2 --

15 Prioritization Metrics for Green Street Projects Metric Points Imperviousness (%) X < X < X < X < X < X < Hydrologic Soil Group C/D B A -- Slope (%) 5 > X > 4 4 X > 3 3 X > 2 2 X > 1 1 X > 0 -- Weight Factor Within flood-prone storm drain catchments Contains PCB Interest Areas None Moderate High 2 Within Priority Development Area Co-located with another agency project Augments water supply No Opportunity for capture and reuse Above groundwater recharge area and not above groundwater contamination area Water quality source control 2 Reestablishes natural hydrology Creates or enhances habitat Community enhancement No Opportunities for other enhancements Within DAC or MTC Community of Concern --

16 Overview of Prioritization Results

17 Overview of Prioritization Results

18 Top 10% of Green Street Opportunities Jurisdiction By Jurisdiction # of Projects % Campbell % Cupertino % Los Altos % Los Altos Hills % Los Gatos % Milpitas % Monte Sereno % Morgan Hill % Mountain View % Palo Alto % San Jose 2, % Santa Clara % Santa Clara County % Saratoga % Sunnyvale %

19 SWRP Web Viewer

20 SWRP Web Viewer

21 SWRP Content Elements Required by the State Board s Storm Water Resource Plan Guidelines Introduction/Background Watershed Description Water Quality Issues and Priorities Organization, Coordination, and Collaboration Identification and Prioritization of Projects Implementation Strategy Education, Outreach, Public Participation Conceptual Designs

22 Concept Design Mary Avenue

23 Concept Design

24 SWRP Implementation The list of identified GSI opportunities will be included in Co-permittee GSI Plans Implementation of identified opportunities depends on: Local and regional priorities Funding for design and construction Funding for operation and maintenance Public support *The SWRP does not represent a commitment by participating entities to implement specific projects

25 Next Steps Final SWRP will be submitted in December 2018 Final SWRP will be posted on the SCVURPPP website: SWRP will be updated approximately once every five years

26 Questions? SWRP Webpage